Mixing Efficiency across Rayleigh-Taylor and Richtmeyer-Meshkov Fronts
Mixing Efficiency across Rayleigh-Taylor and Richtmeyer-Meshkov Fronts作者机构：Applied Physics Department Politecnica University of Cataluñ a (UPC) Barcelona Spain Applied Mathematics Department Complutense University of Madrid (UCM) Madrid Spain Earth Physics Astronomy and Astrophsics II Department Complutense University of Madrid (UCM) Madrid Spain
出 版 物：《Open Journal of Fluid Dynamics》 (流体动力学（英文）)
年 卷 期：2015年第5卷第2期
页 面：145-150页
主 题：Rayleigh-Taylor Instability Richtmyer-Meshkov Instability Mixing Efficiency Front Evolution Fractal Dimension
摘 要：Mixing generated by gravitational acceleration and the role of local turbulence measured through multifractal methods is examined in numerical experiments of Rayleigh-Taylor and Richtmyer-Meshkov driven front occurring at density interfaces. The global advance of the fronts is compared with laboratory experiments and Nusselt and Sherwood numbers are calculated in both large eddy simulation (LES) and kinematic simulation KS models. In this experimental method, the mixing processes are generated by the evolution of a discrete set of forced turbulent plumes. We describe the corresponding qualitative results and the quantitative conclusions based on measures of the density field and of the height of the fluid layers. We present an experimental analysis to characterize the partial mixing process. The conclusions of this analysis are related to the mixing efficiency and the height of the final mixed layer as functions of the Atwood number, which ranges from 9.8 × 10−3 to 1.34 × 10−1.
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